Paulionytė, Judita, and Rasa Vaiškūnaitė. “Research on the Physical and Chemical Properties of Sewage Treatment Sludge Biochar and Its Preparation for Wastewater”. Mokslas – Lietuvos ateitis / Science – Future of Lithuania 15 (September 12, 2023). Accessed December 26, 2024. https://tede.vgtu.lt/index.php/MLA/article/view/19431.